Browse All Tools

Tool directory

Search every free Cobalt Tools utility.

Find browser-first image, PDF, QR, developer and 3D tools without opening empty categories or account screens. Every result below links to a real working tool.

Browse Image Tools Start with UploadReady

File-processing tools stay local in the browser where technically possible.

Search all free toolsSort

All production tools

91 free tools available.

Popular: UploadReady, Metadata Cleaner, HTML to Image, 3D Model Viewer

1024x1024 Image

Create an exact 1024 by 1024 square image for profiles, catalogs or forms.

2 Pages per Sheet

Put two PDF pages on each A4 sheet.

2x2 Inch Photo

Crop and resize a portrait to a 2x2 inch-style square at 300 DPI.

300x300 Image

Create a small 300 by 300 pixel square image for avatars and forms.

35x45mm Photo

Prepare a 35x45mm-style photo at 300 DPI dimensions for printing or upload.

3D Model Viewer

View GLB, STL and OBJ models online for free with orbit controls, scene hierarchy, wireframe mode and material inspection.

4 Pages per Sheet

Put four PDF pages on each A4 sheet.

600x600 Image

Crop and resize an image to an exact 600 by 600 pixel square.

800x800 Image

Make an exact 800 by 800 pixel square image for products, profiles or portals.

Add Blank Page

Add one blank page to the end of a PDF.

Application Photo

Make a square, lightweight photo for application forms that need a compact file.

Developer Tools

Base64 Encode Decode

Encode and decode Base64 text locally in your browser.

Case Converter

Convert text between uppercase, lowercase, title case, slug, snake case and camel case.

Character Counter

Count characters for forms, SEO titles, descriptions and short text limits.

Clean PDF Metadata

Best-effort document metadata cleanup.

Compress Image

Compress images online for free with local browser processing.

Convert from JPG

Convert JPG images to PNG or WEBP online for free.

Convert to JPG

Convert images to JPG online for free.

Crop Image

Crop images online for free with browser processing.

Crop PDF

Crop PDF margins. Free browser PDF tool for crop pdf.

Developer Tools

Developer Tools

Format JSON, encode Base64, decode URLs, generate UUIDs, convert timestamps and count text with free browser utilities.

Duplicate Pages

Duplicate every PDF page once.

Extract Pages

Extract selected PDF pages into a new document.

Extract Text

Extract selectable PDF text to a TXT file.

Favicon Generator

Generate favicon files from PNG, JPG or WEBP with crop, fit and transparent background options.

Favicon Preview

Preview favicon output at small sizes before downloading the final generated icon files.

GIF to JPG

Convert GIF to a static JPG online for free.

GLB to USDZ

Convert GLB 3D models to USDZ online for free so they can be tested with iPhone, iPad and Apple AR Quick Look.

GLB Viewer

Open and preview GLB 3D models online for free with local browser rendering, hierarchy, wireframe and material details.

Grayscale PDF

Convert PDF pages to grayscale.

HEIC to JPG

Convert iPhone HEIC photos to JPG in your browser when browser conversion succeeds.

HEIC to WEBP

Convert HEIC photos to WEBP online for free.

HTML to Image

Convert pasted HTML and CSS to PNG, JPG or SVG online for free with local browser rendering.

Image to 100KB

Compress and resize an image until it fits under a 100KB upload limit.

Image to 200KB

Create an upload-ready image under 200KB without installing software.

Image to 500KB

Reduce image file size to fit under a 500KB upload requirement.

Developer Tools

Image to Base64

Convert image files to Base64 and copy ready-to-use snippets without uploading the image.

Image to PDF

Convert JPG, PNG or WEBP images into a PDF.

Image to WEBP

Convert images to WEBP online for free.

Image Under 2MB

Make an image fit under a 2MB maximum upload size.

JPG to 100KB

Shrink a JPG photo to fit a 100KB upload limit while keeping it usable.

JPG to 200KB

Compress a JPG image to a practical 200KB limit for online forms.

JPG to Favicon

Create favicon assets from JPG images with crop and fit controls for square icon output.

JPG to PDF

Convert images to PDF. Free browser PDF tool for jpg to pdf.

JPG to PNG

Convert JPG to PNG online for free.

JPG to WEBP

Convert JPG to WEBP online for free.

Developer Tools

JSON Formatter

Format, validate and minify JSON locally in your browser.

Meme Generator

Create meme images online for free.

Merge PDF

Combine PDFs in the order you upload them.

Metadata Cleaner

Strip embedded EXIF, GPS, XMP, C2PA and AI generator metadata from images by re-encoding them locally in your browser.

Online Form Resizer

Resize and compress a photo for an online application, profile or upload portal.

Organize PDF

Reorder PDF pages with a simple page order field.

Page Numbers

Add bottom-center page numbers.

PDF Page Count

Count pages in a PDF. Free browser PDF tool for pdf page count.

PDF to A4

Fit PDF pages onto A4 pages.

PDF to JPG

Convert PDF pages to JPG images.

PDF to Letter

Fit PDF pages onto US Letter pages.

PDF to PNG

Convert PDF pages to PNG images.

PDF to WEBP

Convert PDF pages to WEBP images.

PDF Tools

Merge, split, organize, convert, resize, extract text, count pages, clean metadata, rotate and watermark PDFs with free browser-first tools.

Photo Editor

Edit photos online for free with simple browser controls.

Photo Under 1MB

Reduce a large camera photo to under 1MB for upload limits.

PNG QR Generator

Generate static QR codes with PNG output selected by default.

PNG to 100KB

Convert and compress a PNG image to a small JPG that fits under 100KB.

PNG to Favicon

Convert PNG images into favicon assets with crop, fit and transparent background handling.

PNG to JPG

Turn a PNG into a smaller JPG for upload forms and websites.

PNG to PDF

Convert PNG images to PDF.

PNG to WEBP

Convert PNG to WEBP online for free.

QR Code Generator

Generate static QR codes for common text, URL and contact formats with no redirects or tracking.

Remove Pages

Remove selected pages from a PDF.

Remove Solid Background

Remove simple solid image backgrounds online for free.

Resize Image

Resize images by pixel width and height online for free.

Reverse PDF

Reverse PDF page order. Free browser PDF tool for reverse pdf.

Rotate Image

Rotate images online for free.

Rotate PDF

Rotate PDF pages. Free browser PDF tool for rotate pdf.

Signature Text

Add a visual signature text stamp.

Split PDF

Create a new PDF from a selected page range.

Square Profile Picture

Crop any image into a square profile picture and optionally compress it.

SVG QR Generator

Generate static QR codes with SVG output selected by default.

SVG to JPG

Convert SVG to JPG online for free.

Developer Tools

Timestamp Converter

Convert Unix timestamps and ISO dates locally in your browser.

UploadReady

Make images ready for exact upload limits with browser-based resize, compression, crop and conversion presets.

Upscale Image

Upscale images online for free with browser processing.

Developer Tools

URL Encode Decode

Encode and decode URL components locally in your browser.

Developer Tools

UUID Generator

Generate browser-side UUIDs for development and testing.

Watermark Image

Add a text watermark to images online for free.

Watermark PDF

Add a text watermark to a PDF.

WEBP to JPG

Convert a WEBP image to JPG when an upload form does not accept WEBP.

WEBP to PDF

Convert WEBP images to PDF.

WEBP to PNG

Convert WEBP to PNG online for free.

Word Counter

Count words, characters and reading time for articles, forms and social posts.